MEMS microphone controler
This module controls the MEMS microphone embedded on the Nexys4 board and outputs its data
Using this module
Just configure the generic values and enjoy the sample on data_out when data_en = '1'. data_en is set at the SAMPL_FREQ frequency on average. If SAMPL_FREQ is not a divider of CLK_FREQ_HZ, the exact period between two samples is subject to 1 clock cycle variation from time to time.
No asumptions should be made on the value of data_out when data_en is not set.
Module generics
- CLK_FREQ_HZ : The system clock frequency expressed in Hz. It is used to provide an accurante sampling frequency.
- OUT_BITS : The number of bits to express the sample value. The higher this number, the lower the maximum frequency. This value can range from 6 to allow high sampling rate, to 10 to improve sample precision
- SAMPL_FREQ : The desired audio sampling frequency. This value is limited by the precision of the samples.